Influence of Aluminosilicate Filler on the Physicomechanical Properties of Polypropylene-Polycaproamide Composites
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INFLUENCE OF ALUMINOSILICATE FILLER ON THE PHYSICOMECHANICAL PROPERTIES OF POLYPROPYLENE-POLYCAPROAMIDE COMPOSITES О. V. Suberlyak,1 V. V. Krasins’kyi,1,2 V. V. Moravs’kyi,1 H. Gerlach,3 and T. Jachowicz4
UDC 66.037.38
Composites based on mixtures of polypropylene with PA-6 polycaproamide and montmorillonite aluminosilicate filler are developed to get new structural materials. The influence of the concentrations of components of the composition on the physicomechanical, deformation, and relaxation properties of the composites is analyzed. Keywords: nanocomposites, nanofiller, montmorillonite, polypropylene, polycaproamide, relaxation and physicomechanical properties, thermomechanical curve.
In recent years, composite materials based on polymers containing nanosized fillers attract much attention of the researchers. Polymeric nanocomposites (NC) have numerous advantages over pure polymers and ordinary composites [1]. Thus, in particular, they are characterized by elevated strength characteristics with preservation of plasticity, high thermal stability and fire resistance, low gas permeability, etc. Moreover, it is especially important that the indicated characteristics are noticeably improved even for relatively low contents of the filler in the polymeric matrix (1–5 wt.%). At present, as the most extensively used large-tonnage polymers produced by the industry, we can mention the simplest polyolefines; in particular, polyethylene, polypropylene (PP), their copolymers, and mixtures. The problem of development of new methods for the improvement of the operating characteristics of materials based on these polymers remains quite urgent. One of the well-known trends in the modification of the properties of polyolefines is connected with the introduction of inorganic fillers. Note that these fillers are, as a rule, thermodynamically incompatible with the organic polymeric matrix. To remove this disadvantage, they are subjected to surface modification and intercalation [2]. These nanofillers are obtained either by the method of synthesis (which is quite costly) or by the dispersion of natural mineral substances (which is much less costly). At the same time, it should be emphasized that the natural clay materials and, in particular, montmorillonite (ММТ), are capable of dispersion in the polymeric matric into individual nanoplates with a thickness of ∼ 1 nm [3]. To obtain polymeric NC containing polar layered silicates, it is necessary to create conditions for the dispersion of clay in nonpolar polyolefines and penetration (intercalation) of macromolecules into the space between the silicate plates. For this purpose, clays are preliminarily modified with the use of different surfactants. The adsorption of these surfactants on the surfaces of the indicated plates leads to the formation of organophilic layers. Their properties determine, on the one hand, the dispersibility of the filler in the polymer and, on the oth1 2 3 4
“L’vivs’ka Politekhnika” National University, Lviv, Ukraine. Corresponding author; e-mail: vkrasinsk
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